Modified wollastonite, and preparation method and application thereof

Abstract

The invention provides modified wollastonite, and a preparation method and application thereof, belonging to the field of mineral material processing and application. The preparation method of the modified wollastonite provided by the invention comprises the following steps: mixing wollastonite with a titanate coupling agent, stearic acid and fatty acid polyoxyethylene ester, and carrying out a modification reaction to obtain inorganic modified wollastonite powder. According to the invention, a composite modifier composed of the titanate coupling agent, the stearic acid and the fatty acid polyoxyethylene ester is adopted for modification of the wollastonite, so the interface interaction between the wollastonite and a filling material can be improved, and the obtained modified product has improved binding capacity with PP and other materials and is improved in mechanical properties. Results of embodiments show that a PP composite material obtained by filling the PP with the modified wollastonite has a simply supported beam strength of more than 12.5 J, notch impact strength of no less than 7kJ/m<2>, tensile strength of more than 31 MPa, bending strength of more than 38 MPa, bendingmodulus of more than 1820 MPa and an oil absorption value of less than or equal to 23 mL/100 g.

Description

technical field [0001] The invention relates to the field of mineral material processing and application, in particular to a modified wollastonite and its preparation method and application. Background technique [0002] Wollastonite (CaSiO 3 ) is a calcium-containing mineral, metasilicate. Natural wollastonite has acicular, fibrous and radial structures. Wollastonite has excellent properties such as non-toxicity, low oil absorption, hydrophilicity, high thermochemical stability and whiteness, and is widely used in industrial fields such as architectural ceramics, coatings, plastic rubber, metallurgy, and refractory. In China, the annual output of wollastonite is 300,000 tons, accounting for 50% of the total international wollastonite output. However, the current use of wollastonite in China is limited to the simple process of wollastonite ore, and further technologies such as ultra-fine grinding and mineral surface modification have not been widely used in the developmen...

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Problems solved by technology

[0004] So far, the surface modification of wollastonite filler is mostly surface organic modification, such as using silane coupling agent to carry out surface modification to wollastonite in CN200810224268.8, and the obtained modified wollastonite has reinforcing properties It has been improved to a certain extent, but the oil absorption value has not been significantly improved; CN201410314226.9 uses titanate coupling agent to modify the surface of wollastonite, but because no other solubilizer is added, the modification effect is not obvious; CN201310471472.0 Using aluminate coupling agent and polyethylene glycol to modify the surface of wollastonite, the modification effect is obvious in terms of oil absorption value, but in practical application, the improvement of the mechanical properties of the product is not obvious; CN201611089751.0 Maleic anhydride polypropylene is used to modify the surface of wollastonite. As a filling material for PP, the raw material is easy to obtain and easy to operate, but the mechanical properties of the filled PP material have not been significantly improved.

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